/ɪkˈstrækʃn ||; ɪkˈstrækʃən/noun (
formal 正式)
1 [C,U] the act of taking sth out 取出；索取: extraction of salt from the sea 从海水里提取盐Dentists report that children are requiring fewer extractions. 据牙科医生说，孩子需要拔牙的较以往少。
2 [U] family origin 世系；家世: He's an American but he's of Italian extraction. 他是美国人，但祖裔意大利。